<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="" oninput="x.value=parseInt(a.value)"+parseInt(b.value)>
        <input id="a" min="10" max="100"  type="range">100+
        <input id="b" type="text">=
        <output name="x" for="a b"></output>
    </form>
</body>
</html>